#头条创作挑战赛#

本文同步本人掘金平台的文章：

上一篇文章是 Angular 项目实现权限控制。最近自己在网上看到别人使用 vue 进行自定义 video 的操纵。加上不久前实现了 angular 自定义 video 的相关需求， 遂来记录一下，作为交流思考

实现的功能如下：

播放 / 停止快退 / 快进 / 倍速声音开 / 声音关进入全屏 / 退出全屏进入画中画 / 退出画中画 【安卓平板不支持，不建议使用】经过时长 / 总时长播放进度条功能：支持点击，拖拽进度声音进度条功能：支持点击，拖拽进度

如图：

下面我们来一一实现：

这里的重点不在布局，我们简单来定义一下：

<!-- app.component.html --><div class="video-page">  <div class="video-tools">    <button nz-button nzType="primary" (click)="play('btn')" style="margin-right: 12px;">播放 ✅</button>    <button nz-button nzType="primary" (click)="pause('btn')">暂停 ✅</button>    <ng-container>      <button nz-button nz-dropdown [nzDropdownMenu]="menuForward" nzPlacement="bottomCenter" style="margin: 0 12px;">快进 ✅</button>        <nz-dropdown-menu #menuForward="nzDropdownMenu">          <ul nz-menu>            <li nz-menu-item (click)="forwardSecond(10)">快进 10 s</li>            <li nz-menu-item (click)="forwardSecond(20)">快进 20 s</li>          </ul>        </nz-dropdown-menu>    </ng-container>    <ng-container>      <button nz-button nz-dropdown [nzDropdownMenu]="menuBack" nzPlacement="bottomCenter">快退 ✅</button>        <nz-dropdown-menu #menuBack="nzDropdownMenu">          <ul nz-menu>            <li nz-menu-item (click)="retreatSecond(10)">快退 10 s</li>            <li nz-menu-item (click)="retreatSecond(20)">快退 20 s</li>          </ul>        </nz-dropdown-menu>    </ng-container>    <ng-container>      <button nz-button nz-dropdown [nzDropdownMenu]="speedUp" nzPlacement="bottomCenter" style="margin: 0 12px;">倍速 ✅</button>        <nz-dropdown-menu #speedUp="nzDropdownMenu">          <ul nz-menu>            <li nz-menu-item (click)="speedUpVideo(1)">正常</li>            <li nz-menu-item (click)="speedUpVideo(2)">2 倍</li>            <li nz-menu-item (click)="speedUpVideo(4)">4 倍</li>          </ul>        </nz-dropdown-menu>    </ng-container>    <button nz-button nzType="primary" (click)="openOrCloseVoice()">声音开 / 声音关 ✅</button>    <button nz-button nzType="primary" style="margin: 0 12px;" (click)="toFullScreen()">全屏 ✅</button>    <br />    <button nz-button nzType="primary" style="margin-top: 12px;" (click)="entryInPicture()">进入画中画 ⚠️ 安卓平板不支持</button>    <button nz-button nzType="primary" style="margin: 12px 12px 0 12px;" (click)="exitInPicture()">退出画中画 ⚠️ 安卓平板不支持</button>    <br />    <div style="display: flex; justify-content: flex-start; align-items: center; margin: 12px 0;">      经过时长 / 总时长 ： ✅ {{ currentTime }}  / {{ totalTime }}    </div>    <!-- 进度条 -->    <div style="display: flex; justify-content: flex-start; align-items: center; margin: 12px 0;">      进度条：✅      <div        class="custom-video_control-bg"        (mousedown)="handleProgressDown($event)"        (mousemove)="handleProgressMove($event)"        (mouseup)="handleProgressUp($event)"      >        <div          class="custom-video_control-bg-outside"          id="custom-video_control-bg-outside"        >          <span            class="custom-video_control-bg-inside"            id="custom-video_control-bg-inside"          ></span>          <span            class="custom-video_control-bg-inside-point"            id="custom-video_control-bg-inside-point"          ></span>        </div>      </div>    </div>    <div style="display: flex; justify-content: flex-start; align-items: center; margin: 12px 0;">      声音条：✅      <div class="custom-video_control-voice">        <span class="custom-video_control-voice-play">          <i nz-icon nzType="sound" nzTheme="outline"></i>        </span>        <div          class="custom-video_control-voice-bg"          id="custom-video_control-voice-bg"          (mousedown)="handleVolProgressDown($event)"          (mousemove)="handleVolProgressMove($event)"          (mouseup)="handleVolProgressUp($event)"        >          <div             class="custom-video_control-voice-bg-outside"            id="custom-video_control-voice-bg-outside"          >            <span               class="custom-video_control-voice-bg-inside"              id="custom-video_control-voice-bg-inside"            ></span>            <span               class="custom-video_control-voice-bg-point"              id="custom-video_control-voice-bg-point"            ></span>          </div>        </div>      </div>    </div>  </div>  <div class="video-content">    <video id="video" class="video" style="width: 100%" poster="assets/poster.png">      <source type="video/mp4" src="assets/demo.mp4">      Sorry, your browser doesn't support.    </video>  </div></div>复制代码

这里使用了 angular ant design，之前写了一篇相关文章，还不熟悉的读者可前往 Angular 结合 NG-ZORRO 快速开发

播放 / 停止

这里直接调用 video 对象的方法 play() 和 pause():

// app.component.ts// 播放按钮事件play(flag: string | undefined) {  if(flag) this.videoState.playState = true  this.videoState.play = true  this.video.play()}// 暂停按钮事件pause(flag: string | undefined): void {  if(flag) this.videoState.playState = false  this.video.pause()  this.videoState.play = false}复制代码

这里自定义的 play 和 pause 方法加上了一个标志，对下下面要讲的进度条的控制有帮助，上面的代码可以更加简洁，读者可以简写下。

快退 / 快进 / 倍速

这里的快退，快进和倍速设置了不同的选项，通过参数进行传递：

// app.component.ts// 快进指定的时间forwardSecond(second: number): void {  this.video.currentTime += second; // 定位到当前的播放时间 currentTime}// 后退指定的时间retreatSecond(second: number): void {  this.video.currentTime -= second}// 倍速speedUpVideo(multiple: number): void {  this.video.playbackRate = multiple; // 设定当前的倍速 playbackRate}复制代码

声音的开关使用 video 的 muted 属性即可：

// app.component.ts// 开或关声音openOrCloseVoice(): void {  this.video.muted = !this.video.muted;}复制代码

全屏的操作也是很简单，使用 webkitRequestFullScreen

// app.component.ts// 全屏操作toFullScreen(): void {  this.video.webkitRequestFullScreen()}复制代码

全屏后，按 esc 可退出全屏

进入画中画 / 退出画中画

画中画相当于弹窗缩小视频~

// app.component.ts// 进入画中画entryInPicture(): void {  this.video.requestPictureInPicture()  this.video.style.display = "none"}// 退出画中画exitInPicture(): void {  if(this.document.pictureInPictureElement) {    this.document.exitPictureInPicture()    this.video.style.display = "block"  }}复制代码

设置 video 的样式，是为了看起来不突兀...

经过时长 / 总时长

记录视频的总时长和视频当前的播放时长。我们已经来组件的时候就获取视频的元信息，得到总时长；在视频播放的过程中，更新当前时长。

// app.component.ts// 初始化 video 的相关的事件initVideoData(): void {  // 获取视频的总时长  this.video.addEventListener('loadedmetadata', () => {    this.totalTime = this.formatTime(this.video.duration)  })  // 监听时间发生更改  this.video.addEventListener('timeupdate', () => {    this.currentTime = this.formatTime(this.video.currentTime) // 当前播放的时间  })}复制代码

formatTime 是格式化函数

播放进度条功能

监听鼠标的点击，移动，松开的事件，对视频的播放时间和总事件进行相除，计算百分比。

// app.component.ts// 进度条鼠标按下handleProgressDown(event: any): void {  this.videoState.downState = true  this.pause(undefined);  this.videoState.distance = event.clientX + document.documentElement.scrollLeft - this.videoState.leftInit;}// 进度条 滚动条移动handleProgressMove(event: any): void {  if(!this.videoState.downState) return  let distanceX = (event.clientX + document.documentElement.scrollLeft) - this.videoState.leftInit  if(distanceX > this.processWidth) { // 容错处理    distanceX = this.processWidth;  }  if(distanceX < 0) { // 容错处理    distanceX = 0  }  this.videoState.distance = distanceX  this.video.currentTime = this.videoState.distance / this.processWidth * this.video.duration}// 进度条 鼠标抬起handleProgressUp(event: any): void {  this.videoState.downState = false  // 视频播放  this.video.currentTime = this.videoState.distance / this.processWidth * this.video.duration  this.currentTime = this.formatTime(this.video.currentTime)  if(this.videoState.playState) {    this.play(undefined)  }}复制代码

这里需要计算进度条的位置，来获取点击进度条的百分比，之后更新视频的当前播放时间。当然，我们还得有容错处理，比如进度条为负数时候，当前播放时间为0。

声音进度条

我们实现了播放进度条的操作，对声音进度条的实现就很容易上手了。声音进度条也是监听鼠标的点击，移动，松开。不过，这次我们处理的是已知声音 div 的高度。

// app.component.ts// 声音条 鼠标按下handleVolProgressDown(event: any) {  this.voiceState.topInit = this.getOffset(this.voiceProOut, undefined).top  this.volProcessHeight = this.voiceProOut.clientHeight  this.voiceState.downState = true //按下鼠标标志  this.voiceState.distance = this.volProcessHeight - (event.clientY + document.documentElement.scrollTop - this.voiceState.topInit) }// 声音 滚动条移动handleVolProgressMove(event: any) {  if(!this.voiceState.downState) return    let disY = this.voiceState.topInit + this.volProcessHeight - (event.clientY + document.documentElement.scrollTop)    if(disY > this.volProcessHeight - 2) { // 容错处理      disY = this.volProcessHeight - 2    }    if(disY < 0) { // 容错处理      disY = 0    }    this.voiceState.distance = disY    this.video.volume = this.voiceState.distance / this.volProcessHeight    this.videoOption.volume = Math.round(this.video.volume * 100)}// 声音 鼠标抬起handleVolProgressUp(event: any) {  this.voiceState.downState = false //按下鼠标标志  let voiceRate =  this.voiceState.distance / this.volProcessHeight  if(voiceRate > 1) {    voiceRate = 1  }  if(voiceRate < 0) {    voiceRate = 0  }  this.video.volume = voiceRate  this.videoOption.volume = Math.round(this.video.volume * 100); // 赋值给视频声音}复制代码

如图：

效果演示

完成了上面的内容，我们以一个 gif 图来展示效果：

全屏，声音和画中画比较难截图，Gif 上体现不来

详细的代码，请前往 video-ng 获取。

【完】✅